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Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Detail) $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) MW | Nov. 30, 2017 USD ($) MW | Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) project MW | May 31, 2017 USD ($) project | Apr. 30, 2017 MW | Mar. 31, 2017 USD ($) project | Feb. 28, 2017 USD ($) | Aug. 31, 2016 project | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jan. 31, 2017 | Sep. 30, 2016
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of project |  |  |  |  |  |  |  |  |  |  | $ 108 | $ 343 |  |
Solar Frontier Americas Holding, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Number of projects | project |  |  |  |  |  |  |  | 1 |  | 2 |  |  |  |
Cash consideration |  |  |  |  |  |  |  | $ 77 |  |  |  |  |  |
Cost of project |  |  |  |  | $ 78 |  |  |  |  |  |  |  |  |
MW capacity | MW |  |  |  |  | 30 |  |  |  |  |  |  |  |  |
Discontinued efforts on acquisition of additional MW capacity | MW |  |  |  |  |  |  | 20 |  |  |  |  |  |  |
Community Energy Solar, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cash consideration |  |  |  |  |  |  |  |  | $ 29 |  |  |  |  |
Cost of project | $ 205 |  |  |  |  |  |  |  |  |  |  |  |  |
MW capacity | MW | 100 |  |  |  |  |  |  |  |  |  |  |  |  |
Solar Projects from Cypress Creek Renewables, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Cash consideration |  |  |  |  |  | $ 154 |  |  |  |  |  |  |  |
Cost of project |  |  |  |  | $ 160 |  |  |  |  |  |  |  |  |
MW capacity | MW |  |  |  |  | 79 |  |  |  |  |  |  |  |  |
Solar Projects from Hecate Energy Virginia C&C LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Number of projects | project |  |  |  |  | 1 | 2 |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 40 | $ 16 | $ 56 |  |  |  |  |  |  |  |
Cost of project |  | $ 57 |  |  |  |  |  |  |  |  |  |  |  |
MW capacity | MW |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Cost of project |  | $ 41 |  |  |  |  |  |  |  |  |  |  |  |
MW capacity | MW |  | 20 |  |  |  |  |  |  |  |  |  |  |  |
Four Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects | project |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 40 |  |  |  |  |  |  |  |  |
Two Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects | project |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 20 |  | $ 20 |  |  |  |  |  |  |  |  |

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